Press



5 Sheets-Sheet 1 C w y Y m N u |I T G/ J R www N. A o .bvd E V ,v v A n.mlnlnaal M Jf//v f J. J. CAVAGNARO PRESS Filed Feb. 5, 1929 June 10,1930.

- June l0, 1930.

J. J. CAVAGNARO PRESS Filed Feb. 5, 1929 5 ,Sheets-Sheet 2 lllllliATTQRNEY June 10, 1930. J. J. cAvAGNARo PRESS Filed Feb. 5. 1929 5Sheets-Sheet 3 INVENTOR ATTORNEY June 1o, 1930. J. J. cAvAGNARo 'PRESS45 Sheets-Sheet 4 FildA Febx 5, 1929 ATTORNEY June 1o, 1930. 1.1.CAVAGNARO 1,763,131

PRESS FledFeb. 5, 1929 5 Sheets-Sheet 5 VENTOR ATTQRNEY Patented .lune10, 193() JOHN J. CAVAGNARO, OF RIDGEWOOD, NEW JERSEY PRESS Applicationfiled February 5, 1929. Serial No. 337,631.

My invention relates to a press. One of the numerous uses for which apress in accordance with my invention is adapted is for embossing coatedfabrics, leather, paper and the like. Such a press is shown herein forillustrating the principle of the invention and affording anunderstanding thereof, but not for limitation.

I find that the movement of the sliding w platen or platens of a presssuch as an embossing press can be advantageously divided or separatedinto three parts or phases, namely: maximum opening movement; the freemovement of the working stroke during l5 which the feeding isaccomplished; and the final closing movement with a dwell for pressing.The-maximum opening is required only occasionally and when the press isat rest, as for affording access for making changes gg of platens andthe like; the stroke required in operation, as in embossing work, may beconsiderably less than such maximum opening, but should be suflicient topermit the feeding of the fabric or other work forward I g; instep-by-step movement, and during the major part of which movement thesliding platen moves freely so that the only power required is thatneeded to lift such platen; and the iinal closing stroke, with a dwellfor applying the pressure, preferably hydraulic pressure, can be througha verv short distance.

In accordance with my invention, preferably manually operated means areprovided f er for securing the maximum opening movement of the press atthe occasional intervals when same is required, as for changing dies.Also, provision is made for accomplishing the lesser movement of thepress elements to permit vthe feeding of the work by light, rapidlyoperated means, preferably mechanical means, not requiring much power,during operation whereof the powerful hydraulic closing means iscompletely out of operation; and the latter comes into operation onlyafter the press has already been almost closed, this requiring verylittle travel of the hydraulic closing means and a relatively smallquantity of the water, oil, or other liquid used in its operation, andcorrespondingly low investment in and space needed for l pumps andaccumulators.

In the accompanying drawings of an illustrative embodiment of myinvention, Fig. 1 is a front elevation with parts broken away. In thisview, the sliding press bed or platen is at the top of its mechanicalworking stroke ready for the application of Vhydraulic pressure.

Fig. 2 is a rear elevational view.

Fig. 3 is a rear elevation partly in section, taken on the line 3-3 ofFig. 4. In this view, the sliding platen is shown at its lowestposition, as for changing matrices, etc.

Fig. 4 is a horizontal section on line 4-4 Fig. 1 with the cover of thegear train box partly broken away.

Fig. 5 is a section on substantially the line 5-5 of Fig. '4 and showingalfso a partly broken away portion of the sliding platen.

Fig. 6 is a section on substantially the line 6-6 of Fig. 4. Theposition of parts in this view is the same as in Fig. 2.

Fig. 7 is a section on approximately the line 7 7 of Fig. 4, and- Fig. 8is a section on line 8 8 of Fig. 7.

The press illustrated is a conventional'4- column platen press, having abase 10 provided with guide columns 12 to which is secured the head 14.The sliding platen 16 slides on columns 12,1 the steam platens 18 and 2Omay be secured to the press-head 14 and sliding platen 16 respectively.Plates 18 and 2O carry the usual suitably engraved matrices forembossing the work 21 and may be heated and/or cooled, if desired, inany of the usual manners.

The means shown for producing free lifting and lowering movement of thesliding platen 16 to'permit feeding of the work comprise cams,preferably 4 in number, designated 22, 24, 26 and 28, each arrangedunder a corner of the sliding platen 16, and making rolling Contacttherewith through rollers 30. The cani drive is obtained as shown,through the drive pinion 32, gear 34, clutch 36 and shaft 38, drivingcam shaft 40, at one end of the press bed, through bevel gears 42 and44, from which the parallel cam shaft 46 approximately the at theopposite end of the press bed is driven through the connecting shaft 48,and bevel gears 50, 52, and 54, 65. )Vith this arrangement, the pair ofcams 26 and 28 turns with shaft in opposite direction from the pair ofcams 22 and 24 on shaft 46 and, with such arrangement, the respectivepairs of cams are made respectively right and left handed, so as toproduce identical rise and fall of the press bed at the sever-alcorners..

The cam relief at H (Fig. 7) is preferably only sufficient to producepress opening movement sufficient to permit the feed of the work to beperformed. To temporarily lower the cams and sliding platen to a furtherextent, as for replacing matrices, the driving connection of cam shafts40 and 46 to the cams may be through circular disks eccentrically keyedto the shafts at 62, and received in circular recesses 64, eccentricallydisposed within the cams, and, when the shafts 40 and 46 are rotated indirection adapted to transmit rotation from cam shaft to cam, the driveis through pawls 66 pivoted on the cams and spring pressed by springs 68into engagement with teeth 70 on the disks 60. Upon opposite rotation oft-he cam shafts, as by clutching in and turning the normally declutchedhand Wheel 72, the springs 68 yield and disks 60 turn in theeccentrically disposed recesses 64 of the cams, thereby lowering thecams to the position shown in dotted lines in Fig. 7. Before operationsare resumed after such maximum temporary opening, a second half turn ofthe rotation of disks 60 with respect to the cams is completed to returnthe cams to the full lines of Fig. 7.

The mechanically operated lifting of the press bed by the meansdescribed serves to bring same into position for application of thehydraulic closing mechanism, and the parts are shown in such position inFig. 1. llVith the form shown, two rams, 76 and 7 8 work in cylinders 80and 82. To permit the maximum temporary lowering of the press bed abovedescribed, the sliding platen 16 may have recesses 84 and 86 in itslower face, which recesses at such times receive the heads of rams 76,78, as shown in Fig. 3, but it will be understood that such recesses andthe platen lowering` means comprising eccentrics 60 andpawls 664may bedispensed with in case it is desirable to omit the provision forlowering the sliding` platen through the extra distance.

The filling members or gag plates 92 and 94 for transmitting pressurefrom the rams to the sliding platen, with a minimum of ram movement, aremountedfor horizontal reciprocative movement in slides 96 and 98 underthe bottom of sliding platen 16, to be projected as indicated in Fig. 1,or to be retracted toward one another, as shown in Fig; 3l

The mechanisms for quickly moving the gag plates 92, 94 in and out atthe proper time, may take other forms than that shown for simpleillustration of the principle involved, which comprises a sector 100normally turning with cam shaft 40 and having separated partial sets102, 104 of gear teeth adapted to intermittently engagev the teeth ofand actuate the gear 106 and to transmitmultiplied rotational movementto the crank shaft 108 through the pinion 110, shaft 112, and gear train116. The connecting rods 118 and 120 connect the gag plates 92 and 94 tothe pivoted arms 122' and 124, which multiply the throw of the crankarms ofcrank shaft 108 and serve to alternately protract (Figs. l and 4)and retract (Fig. 3) the gag plates 92 and 94. The gag plates 92, 94 canbe notched out as shown at 117, 117 to avoid interference with thepivoted arms and connecting rods. The platen is supported by the camsunder each corner during in and out movement of the gag plates.

The valve mechanism for the supply to and outlet from the hydrauliccylinders of the oil or other fluid, like the gag plate actuatingmechanism, is driven, with the construction shown, from shaft 40, thedriving mechanism comprising sprocket wheel 130, sprocket chain 132,sprocket wheel 134, with which turns gear 136, and gear 138 actuatedfrom gear 136.

Gear 136 has secured to it the cam plate 140 with a recess 142, and gear138 carries a striker 144. These serve for operating the valve lever 146by engagement with the roller 148 thereon. )Vlien recess 142 is oppositeroller 148, striker 144 opens valve 150 against its spring to providecommunication from the branched pipe 152 connected with the hy drauliccylinders to the outlet pipe 154. At other times the dwell part 140 ofthe cam on gear 136 holds the supply valve 156 open to providecommunication from the supply pipe 158 to the pipe 152, leading to thecylinders. rlhe valve operating mechanism for controlling the hydraulicrams is preferably of somewhat less height than as here shown forillustrating the principle of the invention, so as to keep it out of theway of direct horizontal feeding movement of the work.

The oil, water or other hydraulic fluid is preferably recirculated. Onlya relatively small quantity is required because of the small movementofthe rams, their movement and pressure being communicated to thesliding platen through the interposed filling members or gag plates, 92,94, which are rapidly moved in and out as required.

In order to permit shaft 40 to be turned by means of hand wheel 72 asmay be desired for imparting the maximum lowering movement to thesliding platen 16, without producing movement of the filling members 92,94, which would interfere with dropping the sliding platen by engagementwith the rams, and also without producing movement of the hydraulicvalve mechanism, which would interfere by causing the rams to move, Ipreferably connect the hubs of sector 100 and sprocket wheel 130, as bya collar 100a and provide the spline parts 100b and 13()b for detachablyconnecting said parts 100 and 130 to shaft 40.

By shifting sector 100 and sprocket wheel 130, outwardly on shaft, 40 asby means of lever 101, shaft 40 can be freely turned without actuatingeither the gag plates or the hydraulic valves. Lever 101 is moved backto re-engage these several parts with shaft 40 when normal operation isVto be resumed, care being taken first to see to it that the spline andspline ways are in alignment. This restores the original timing. Chain132 has sufficient flexibility to permit such temporary side movement ofsprocket wheel 130.

The preferred cycle of operation is diagrammatically indicated in Fig.7, the various steps taking place in the order indicated below:

A-Mechanical lift, about 1/40 of a revo lution.

B-Gag plates inserted, about 1/40 of a revolution.

C-Hydraulic lift, about 1/40 of a revolution.

D-Dwellunder pressure, about 30/10 of a revolution.

E-IIydraulic drop, about 1/40 of a revolution.

F-Gag plates withdrawn, about 1/40 of a revolution.

G-Mechanical drop, about 1/40 of a revo lution.

H-Rest for feed of goods, 1:/40 of a revolution.

Some of the outstanding advantages obtained with a press in accordancewith my invention are that the hydraulic power may be practically ashigh as desired and this pressure is uniformly distributed insuringuniform and accurate product, the short movement of the hydraulic ramsenables the press to be speeded up and the product increased at the sametime that the power for hydraulic operation is minimized, the light,rapidly moving mechanical parts require but little power for theiroperation, full access can be readily had for changing die plates, etc.,without disturbance of either the mechanical or hydraulic operatingmechanism, wear and necessity for repairs and other maintenance expenseis extremely small and such wear as takes place is distributedpractically evenly so that accuracy is practically independent of wear.The entire apparatus with accessory pumps, accumulators, etc., canbemade very compact, and is simple, durable and relatively inexpensive.

It will be understood that modifications coming within the scope of thefollowing claims are included within the scope of my invention.

I claim:

l. Ina press, a movable press member, means for producing free movementof said member through a relatively considerable distance, and hydraulicmeans, applied to the movable member separately from the applicationthereto of the first named means, for producing the final pressingmovement of said member, said hydraulic means being adapted to producemovement of said member through a shorter distance than the first namedmeans.

2. In a press, a movable press member, mechanical means for producingfree movement of said member through a relatively considerable distance,and hydraulic means, applied to the movable member separately from theapplication thereto of the mechanical means, for producing the finalpressing movement of said member, said hydraulic means being adapted toproduce movement of said member through a shorter distance than themechanical means. Y

3. In a press, a movable press member, means for producing free movementof said member through a relatively considerable distance, hydraulicmeans for supplying the final pressure, and filling members movable intoand out of place between said final pressure supplying means and saidmovable press member, whereby the final pressure is applied throughsubstantially minimum travel of the means for supplying the finalpressure.

4. In a press, a movable press member,

mechanically operated means for producing free movement of said memberthrough a relatively considerable distance, hydraulic means forsupplying the final pressure, and filling members movable into and outof place between said hydraulic final pressure supplying means and saidmovable press member, whereby the final pressure is applied throughsubstantially minimum travel of said hydraulic means. i In a press, amovable press member, means for moving said member through its greatestrange of movement, means for producing free movement of said memberthrough a lesser distance, and means movable through a still lesserdistance for applyingthe final pressure.

6. In a press, a movable press member, manually operable means formoving said member through its greatest range of movement, mechanicallyoperated means for producing free movement of said member through alesser distance, and hydraulic means movable through a still lesserdistance for applying the final pressure.

In a press, a movable press member, a hydraulic ram, a filling member,and means for interposing and withdrawing said filling member frombetween the movable press member and the ram.

8. In a press, a movable press member, a

hydraulic ram, a filling member, means for interposing and withdrawingsaid filling member from between the movable press member and the ram,and means for applying hydraulic pressureto the ram when the fillingmember is interposed.

9. In a press, a movable press member, having a cavity therein, ahydraulic ram in line with the cavity, a movable filling niember adaptedwhen in predetermined position to bridge the cavity, and means forinterposing and withdrawing said filling member from between the movablemember and the ram.

10. In a press, a movable press member, mechanically operated means forproducing free movement of said member through a distance adapted topermit freely moving the work in the press, hydraulic means forimparting final pressure to the press member, filling members, and meansfor prcducing insertion of said filling members between the hydraulicmeans and the press member when the final pressure is applied andproducing withdrawal thereof when the application of pressure has beencompleted.

ll. in a column press comprising a head and a slidable platen, aplurality of cams operating in unison to produce free raising andlowering movement o f the sliding platen, hydraulic ram means forsupplying the final closing pressure to the slidable platen, fillingmembers mounted for in and out movement below the sliding platen, andmeans for actuating the filling members whereby they aire interposedbetween the sliding platen and ram means when application of finalpressure is made.

l2. In a press, an Vabutment press member, a press member movable towardand away therefrom, mechanical means for producing movement ofthe secondmember toward and away from the rst member, filling` means arranged formovement substantially at right angles to the press member movement, andhydraulic ram means operating through the filling means when inpredetermined position to press the movable means forcibly againsttheabutment member.

13. ln a press, an abutment press member, a press member movable towardand away therefrom, a cam under each corner of the movable press member,means for turning the cams in unison, a pair of hydraulic rams under themovable press member and within the inter-cam space, means operating intimed relation with the cams to produce alternate substantial filling ornonfilling of space over the rams under the movable press member, andmeans operating in timed relation to the cams for alternately admittingactuating fluid to or permitting discharge thereof from the ramcylinders.

14, in a press a top abutment, a slidable platentherebelow, meansapplied at the'several corners of the platen for producingup and downmovement thereof through a relatively considerable distance, and meansseparately applied to the platen and inthe general neighborhood of thecenter thereof for applying closing pressure to the platen and producingmovement thereof througlra relatively smaller distance.

l5. In a press a top abutment, a slidable platen thereunder and separateplural means for raising the slidable platen applied .to the platenrespectively in the neighborhood of the platen corners and in theneighborhood of the center thereof.

16. A column press comprising a base, guide columns, a head and slidableplaten, a plurality of cams, means for operating said cams in unison toproduce up and down movement of the platen, means for bodily loweringthe cams to permit maximum lowering of the sliding platen as forreplacement of dies, recesses provided in the under side of the slidingplaten, hydraulic rams in line with said recesses, the. rams beingadapted to enter the recesses at periods of maxi mum lowering of thesliding platen, gag plates arranged to move in and out on the under side,of the sliding platen below said recesses an(L serving, when in placebetween the platen and the rams, to transmit pressure therebetween, andmeans for supplying actuating fiuid under pressure to the hydraulic ramswhen the gag plates are interposed between the rams and the slidingplaten.

In testimony whereof, l have signed my name hereto.

JOHN J. CAVAGNARO.

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